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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
Published on: January 6, 2023
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Snap-through Crack Propagation in Architected Bonded Interfaces Analyzed Using a Mechanoluminescent SAO/E Coating.
Chiara Morano1, Nao Terasaki2, Tianyi Gao3
1Department of Mechanical, Energy and Management Engineering, University of Calabria, Rende (CS) 87036, Italy.
ACS Applied Materials & Interfaces
|August 10, 2023
Summary
Bio-inspired adhesive joints with hollow channels enhance crack resistance. These channels shield crack tips and cause pinning/depinning cycles, improving material toughness and performance.
Area of Science:
- Materials Science
- Mechanical Engineering
- Biomimetics
Background:
- Architected materials offer tunable mechanical properties.
- Bio-inspired designs can lead to novel structural solutions.
- Understanding crack propagation is crucial for material durability.
Purpose of the Study:
- To investigate crack propagation mechanics in bio-inspired adhesive joints.
- To explore the effect of hollow cylindrical channels on crack growth.
- To validate simulation results with experimental data.
Main Methods:
- Selective laser sintering for adherend fabrication.
- Double cantilever beam testing for fracture mechanics.
- Finite element (FE) simulations to analyze strain energy release rate (ERR).
- Cohesive zone modeling for crack pinning/depinning.
- Mechanoluminescent (ML) coating for stress field visualization.
Main Results:
- Channels modulate ERR and provide crack tip shielding.
- FE simulations predict crack pinning/depinning cycles.
- Experimental validation confirms pinning/depinning behavior.
- ML coating reveals transient stress evolution during cracking.
Conclusions:
- Architected channels significantly influence crack propagation.
- Bio-inspired designs with internal structures enhance adhesive joint performance.
- Combined FEA and ML techniques offer powerful insights into fracture mechanics.
